open

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open

1. Nautical free from navigational hazards, such as ice, sunken ships, etc.
2. Music
a. (of a violin or guitar string) not stopped with the finger
b. (of a pipe, such as an organ pipe) not closed at either end
c. (of a note) played on such a string or pipe
3. Commerce
a. in operation; active
b. unrestricted; unlimited
4. (of a wound) exposed to the air
5. (esp of the large intestine) free from obstruction
6. Chess (of a file) having no pawns on it
7. Maths (of a set) containing points whose neighbourhood consists of other points of the same set
8. Computing (of software or a computer system) designed to an internationally agreed standard in order to allow communication between computers, irrespective of size, maufacturer, etc.
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

open

[′ō·pən]
(electricity)
Condition in which conductors are separated so that current cannot pass.
Break or discontinuity in a circuit which can normally pass a current.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

open

(1)
To prepare to read or write a file. This usually involves checking whether the file already exists and that the user has the necessary authorisation to read or write it. The result of a successful open is usually some kind of capability (e.g. a Unix file descriptor) - a token that the user passes back to the system in order to access the file without further checks and finally to close the file.

open

(2)
Abbreviation for "open (or left) parenthesis" - used when necessary to eliminate oral ambiguity. To read aloud the LISP form (DEFUN FOO (X) (PLUS X 1)) one might say: "Open defun foo, open eks close, open, plus eks one, close close."

open

(3)
Non-proprietary. An open standard is one which can be used without payment.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

open

(1) Not proprietary. See open architecture, open system and open source. Contrast with closed architecture and closed system.

(2) To "run" a program (application). Open means "load the program and run it" or "launch the program and run it."

(3) To engage a digital file. From the user's point of view, open also means to read the first block of data. From the programmer's standpoint, open is the first step, and "read the first block of data" is the next. Contrast with close.

(4) To open a switch means to stop current from passing through. The switch is "off." See switch.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
The official said when the cops signaled two persons riding a motorcycle to stop, they opened fire on the personnel and sped away.
Police have arrested the guard who opened fire, Gunasekara said, adding that a probe was under way.
10:00 (GMT+4)Unknown armed militants opened fire on a military convoy during a military parade in Iran's southwestern city of Ahvaz, Fars news agency reported.
They said soldiers opened fire at a group of Palestinians who were protesting east of Deir al-Balah in the central Gaza Strip injuring six who were taken to hospital for treatment.
Israeli navy chased the fishermen offshore as they opened fire at them.
A source at Sweida Police Command told SANA that "an armed group on Sunday evening closed the western highway to the north of Sweida city through putting stones on it in a place that is difficult to see and they opened fire towards the passing cars to force them to stop."
BEIRUT: An unknown assailant opened fire at a soldier in north Lebanon Saturday, wounding the serviceman and a passerby.
Israeli Naval Forces on Sunday morning have opened fire on the fishermen north of Gaza, while the soldiers opened fire on the farmers and citizens along the eastern border of Gaza city.
FIFTY people are dead after a gunman opened fire at an Orlando gay club, the city's mayor said.
Israeli radio said the police opened fire at the Palestinian in Salahuddine Street in East Jerusalem and killed him immediately.
APOLICE marksman opened fire on a young man eight times in just 2.1 seconds after he was stopped in a car en route to a suspected armed robbery, a court has heard.
Gaza, Jan.15 (Petra)--Israeli soldiers Thursday opened fire at Palestinian farmers east of Khan Younis and Al-maghazi refugee camp in Gaza .